Nasalization 비음화 (Preview)

Here is a small rule with an outsized payoff: master it and a whole layer of "foreign accent" disappears from your Korean. It is called nasalization (비음화), and it explains why 국물 is never pronounced the way it looks, and — this will surprise you — why the very first phrase you ever learned, 감사합니다, is actually said [감사함니다]. This is a preview to help you recognize the rule everywhere; the complete rule set is in the Pronunciation group.

The rule in one line

When a stop batchim — one that closes to [k], [t], or [p] — is immediately followed by a syllable beginning with a nasal (ㄴ or ㅁ), the stop turns into the matching nasal. It cannot resist the nasal next door; it borrows its nasality. There are three neat pairings, one per place of articulation:

Each stop becomes the nasal made at its own place of articulation: [k] and [ㅇ] are both velar, [t] and [ㄴ] both alveolar, [p] and [ㅁ] both bilabial. So your tongue and lips don't even move to a new spot — the airflow just reroutes through the nose. Hear all three:

국물 → [궁물]: the [k] of 국, meeting the ㅁ of 물, becomes [ㅇ].

옛날 → [옌날]: the ㅅ closes to [t], then the [t] meets the ㄴ of 날 and becomes [ㄴ].

앞문 → [암문]: the ㅍ closes to [p], then becomes [ㅁ] before the ㅁ of 문.

It's already in your first phrases

The reason to learn this now, at the beginning, is that you are already doing it — or supposed to be — in the most common words in the language. The polite ending -습니다 / -ㅂ니다 contains exactly this collision, ㅂ + ㄴ, in every single formal sentence:

감사합니다 → [감사함니다]: the ㅂ of 합 becomes [ㅁ] before the ㄴ of 니다. You have said this a hundred times; now you know why it sounds like [함니다] and not [합니다]. The same goes for every 습니다 verb — 맛있습니다 → [마시씀니다], 알겠습니다 → [알겓씀니다].

작년 → [장년]: the [k] of 작 nasalizes to [ㅇ] before the ㄴ of 년. And the ubiquitous attributive 있는:

있는 → [인는]: 있 closes to [t], which becomes [ㄴ] before 는.

A close cousin: ㄹ becomes [ㄴ]

There's a partner rule you'll notice constantly: after most consonants, an initial ㄹ is pronounced [ㄴ] (its natural nasal-friendly neighbor). This is why 종로, the Seoul district, is said [종노]:

종로 → [종노], 정리 → [정니], 심리 → [심니]. When this ㄹ→[ㄴ] then bumps into a preceding stop, you get a two-step chain (독립 → [동닙]) — but don't worry about the chains yet; that's what the full nasalization-chain page is for.

English does this too — but optionally

If nasalization feels alien, notice that English does the very same thing, just without admitting it in spelling. Say handbag fast and it becomes "hambag"; input drifts to "imput"; pancake to "pangcake." That is a stop (or [n]) borrowing the place or nasality of its neighbor — the identical instinct. The difference is that in English it is a sloppy, optional shortcut, whereas in Korean it is obligatory and systematic: 국물 is never [국물] in careful speech or casual speech. It is always [궁물]. So you are not learning a new muscle; you are learning to let an old habit fire every time, on purpose.

Common Mistakes

1. Pronouncing the stop as spelled before a nasal. The root error — saying [국물] instead of [궁물], [받는다] as a clean [t].

2. Leaving the ㅂ hard in -합니다. The most common real-life slip: a crisp [p] before 니다 instead of nasalizing to [ㅁ].

3. Reading initial ㄹ as [ㄹ] after a consonant. 정리 is [정니], not [정리]; the ㄹ softens to [ㄴ].

4. Thinking it's optional, like the English version. It isn't. Korean nasalization is a fixed rule, not a fast-speech shortcut — apply it every time, even when speaking slowly and carefully.

Key Takeaways

• A stop batchim [k/t/p] becomes a nasal before ㄴ or ㅁ, at its own place: [k]→[ㅇ], [t]→[ㄴ], [p]→[ㅁ]. 국물 [궁물], 받는다 [반는다], 앞문 [암문].
• It is hiding in your everyday phrases: -습니다/-ㅂ니다 is ㅂ+ㄴ, so 감사합니다 is [감사함니다] and 있는 is [인는].
• A cousin rule turns initial ㄹ into [ㄴ] after most consonants: 종로 [종노], 정리 [정니].
• Like English handbag → "hambag," but obligatory — 국물 is never [국물].
• Just a preview; the directional details, the ㄹ interactions, the multi-step chains, and the blockers are in Pronunciation → Nasalization.